Low-Field Magnetic Separation of Monodisperse Fe3O4 Nanocrystals

@article{Yavuz2006LowFieldMS,
  title={Low-Field Magnetic Separation of Monodisperse Fe3O4 Nanocrystals},
  author={Cafer T. Yavuz and J. T. Mayo and William W. Yu and Arjun Prakash and Joshua C. Falkner and Sujin Yean and Lili Cong and Heather J. Shipley and Amy T. Kan and Mason B. Tomson and Douglas Natelson and Vicki L. Colvin},
  journal={Science},
  year={2006},
  volume={314},
  pages={964 - 967}
}
Magnetic separations at very low magnetic field gradients (<100 tesla per meter) can now be applied to diverse problems, such as point-of-use water purification and the simultaneous separation of complex mixtures. High–surface area and monodisperse magnetite (Fe3O4) nanocrystals (NCs) were shown to respond to low fields in a size-dependent fashion. The particles apparently do not act independently in the separation but rather reversibly aggregate through the resulting high-field gradients… 
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